<?php

/**
 * @package php-font-lib
 * @link    http://php-font-lib.googlecode.com/
 * @author  Fabien M�nager <fabien.menager@gmail.com>
 * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
 * @version $Id: font_table.cls.php 37 2011-11-07 07:38:44Z fabien.menager $
 */

/**
 * Generic font table.
 * 
 * @package php-font-lib
 */
class Font_Table extends Font_Binary_Stream {

    /**
     * @var Font_Table_Directory_Entry
     */
    protected $entry;
    protected $def = array();
    public $data;

    final public function __construct(Font_Table_Directory_Entry $entry) {
        $this->entry = $entry;
        $entry->setTable($this);
    }

    /**
     * @return Font_TrueType
     */
    public function getFont() {
        return $this->entry->getFont();
    }

    protected function _encode() {
        if (empty($this->data)) {
            Font::d("  >> Table is empty");
            return 0;
        }

        return $this->getFont()->pack($this->def, $this->data);
    }

    protected function _parse() {
        $this->data = $this->getFont()->unpack($this->def);
    }

    protected function _parseRaw() {
        $this->data = $this->getFont()->read($this->entry->length);
    }

    protected function _encodeRaw() {
        return $this->getFont()->write($this->data, $this->entry->length);
    }

    final public function encode() {
        $this->entry->startWrite();

        if (false && empty($this->def)) {
            $length = $this->_encodeRaw();
        } else {
            $length = $this->_encode();
        }

        $this->entry->endWrite();

        return $length;
    }

    final public function parse() {
        $this->entry->startRead();

        if (false && empty($this->def)) {
            $this->_parseRaw();
        } else {
            $this->_parse();
        }

        $this->entry->endRead();
    }

}